Because not all of them will divide evenly.

To change a fraction into a decimal number, you divide the top number

by the bottom number. That is, the top number goes into the division box.

You then put the decimal point after the top number and add as many

zeros on the back end as you like. Upon division, the calculations

will either stop with a remainder of zero or a repeating pattern will

occur.

0.75

_______

For example: 3/4 = 3 divided by 4 = 4 | 3.00000

28

--------

20

20

----

0

On the other hand, the fraction 1/3 = 0.33333333.... = 0.3

where the bar indicates that the digits repeat

23/99 = 0.2323232323 = 0.23

The 7s are interesting creatures. They exhibit the property you are speaking of.

There are no more repeating digits than the denominator.

1/7 = 0.142857 <--- 6 repeating digits

This is because the remainder must be LESS than the number you are dividing by.

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